<uses-permission>
element in your app manifest, as a child of the top-level <manifest>
element. For example, an app that needs to access the internet would have this line in the manifest:ContextCompat.checkSelfPermission()
method. For example, this snippet shows how to check if the activity has permission to write to the calendar:PERMISSION_GRANTED
https://bdbrown569.weebly.com/blog/download-mac-os-installer-mojave. , and the app can proceed with the operation. If the app does not have the permission, the method returns PERMISSION_DENIED
, and the app has to explicitly ask the user for permission.PERMISSION_DENIED
from checkSelfPermission()
, you need to prompt the user for that permission. Androidprovides several methods you can use to request a permission, such as requestPermissions()
,as shown in the code snippet below. Calling these methods brings up a standardAndroid dialog, which you cannot customize.shouldShowRequestPermissionRationale()
, that returns true
if the user has previously denied the request, and returns false
if a user has denied a permission and selected the Don't ask again option in the permission request dialog, or if a device policy prohibits the permission.requestPermissions()
methods to request the appropriate permissions. Your app passes the permissions it wants and an integer request code that you specify to identify this permission request. This method functions asynchronously. It returns right away, and after the user responds to the prompt, the system calls the app's callback method with the results, passing the same request code that the app passed to requestPermissions()
.requestPermissions()
, the system shows a standard dialog box to the user. Your app cannot configure or alter that dialog box. If you need to provide any information or explanation to the user, you should do that before you call requestPermissions()
, as described in Explain why the app needs permissions.onRequestPermissionsResult()
method, passing it the user response. Your app has to override that method to find out whether the permission was granted. The callback is passed the same request code you passed to requestPermissions()
. For example, if an app requests READ_CONTACTS
access it might have the following callback method:READ_CONTACTS
permission, the system dialog box just says your app needs access to the device's contacts. The user only needs to grant permission once for each permission group. If your app requests any other permissions in that group (that are listed in your app manifest), the system automatically grants them. When you request the permission, the system calls your onRequestPermissionsResult()
callback method and passes PERMISSION_GRANTED
, the same way it would if the user had explicitly granted your request through the system dialog box.READ_CONTACTS
and WRITE_CONTACTS
in your app manifest. If you request READ_CONTACTS
and the user grants the permission, and you then request WRITE_CONTACTS
, the system immediately grants you that permission without interacting with the user.requestPermissions()
to ask for that permission again, the system immediately denies the request. The system calls your onRequestPermissionsResult()
callback method and passes PERMISSION_DENIED
, the same way it would if the user had explicitly rejected your request again. The method also returns false
if a device policy prohibits the app from having that permission. This means that when you call requestPermissions()
, you cannot assume that any direct interaction with the user has taken place.uses-permission-sdk-23
taginstead of theuses-permission
tag.maxSdkVersion
attribute tospecify that, on devices running a higher version, a particular permission isn'tneeded.